There is one around, although typically I've lost it on Google now. Anyway it had the text very small in the middle of the screen which in my opinion dampened the effect. It also had the fly music playing in the background, which probably isn't the best idea for a screensaver.
Does anyone know of any screensaver writing applications, and a list of Fly/U2 maxims? If so I or someone else could probably put one together quite easily!